121720146 has 16 divisors (see below), whose sum is σ = 243611904. Its totient is φ = 40544784.

The previous prime is 121720133. The next prime is 121720201. The reversal of 121720146 is 641027121.

It is a super-2 number, since 2×121720146² = 29631587884522632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3231 + ... + 15933.

It is an arithmetic number, because the mean of its divisors is an integer number (15225744).

Almost surely, 2^121720146 is an apocalyptic number.

121720146 is an abundant number, since it is smaller than the sum of its proper divisors (121891758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121720146 is a wasteful number, since it uses less digits than its factorization.

121720146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14305.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 121720146 is about 11032.6853485450. The cubic root of 121720146 is about 495.5880451491.

Adding to 121720146 its reverse (641027121), we get a palindrome (762747267).

The spelling of 121720146 in words is "one hundred twenty-one million, seven hundred twenty thousand, one hundred forty-six".